口服乳果糖可治疗肝性脑病的机制是抑制（）
A.白蛋白合成不足
B.门脉压力增高
C.血氨产生过多
D.便秘
E.脾大，脾功能亢进
参考答案：C
--- Well, it’s getting late. I must be going. Thank you for inviting me to the evening party of the Rabbit Year.
---________________.
A．Oh, it’s so late.
B．Thank you for coming.
C．All right.
D．I really had a happy time.
行业竞争结构分析的五因素模型中最重要的竞争力量是______。
A．行业新进入者的威胁 B．供应商讨价还价的能力C．现有企业的竞争 D．替代品的威胁
